Serves three major roles: (1) connects nouns completely ('A and B', a closed list), (2) marks accompaniment ('together with'), and (3) acts as a quotation/thought marker for verbs like 言う and 思う.
[Noun] と [Noun] | [Person] と [Verb] | 「Phrase」と 言う
パンと卵を買います。
Pan to tamago o kaimasu.
I buy bread and eggs.
パン (bread) と (and) 卵 (eggs) — an exhaustive list, nothing else was bought
家族と日本へ行きました。
Kazoku to Nihon e ikimashita.
I went to Japan with my family.
家族 (family) と (with); 日本 (Japan) へ (toward)
「美味しい」と言いました。
"Oishii" to iimashita.
She said, "It's delicious."
と packages the quoted phrase for the verb 言う (say), like quotation marks
• Exhaustive vs Partial: と implies the list is complete. For 'A, B, and other things' (a non-exhaustive list), use や instead. • Mutual Action: Used with verbs that require two parties (結婚する marry, 喧嘩する fight, 会う meet): 彼と結婚する (marry him). • Quotative Particle: The と before 思う (think) and 言う (say) is the same particle, packaging the preceding clause as a single reported concept.
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones と is tested against.
と lists items exhaustively (パンと卵 = just bread and eggs); や lists representative examples implying there are others (パンや卵 = bread, eggs, and such).
と joins nouns as 'A AND B' (both); か joins them as 'A OR B' (a choice): パンと卵 vs パンか卵.
For 'meet', both 友達と会う and 友達に会う occur; と stresses a mutual/planned meeting between equals, while に treats the person as the one-directional target of the meeting.
Study Japanese grammar on LenGaki

Get the Android app
The app adds offline study, home-screen widgets, stroke-order tracing, speaking practice with pronunciation scoring, and an AI tutor that answers questions in context — none of which fits in a browser tab.